P. Abbal, J. Sarris, M. Pradal, J.-L. Berger, and J.-P. Robin, “Influence of the liquid or gazeous nature of the grape berries environment on rheological properties and on colour and nitrogen extractabilities during conditions simulating the Beaujolais wine-making process”, OENO One, vol. 33, no. 2, pp. 87–98, Jun. 1999.